Like many of Sole's treadmills, the S73 has built-in speakers that allow you to plug in an MP3 player (such as an iPod), and listen to your music out loud. This keeps your workout free of headphone wires. The red LED readout shows you the speed, incline, time, distance traveled, calories, pulse and pace. The S73 comes with six pre-programmed workouts, and has a 1/4 mile track feature. Though the S73 and the closely related S77 have pretty much the same specs, the S73 lacks the 3.5HP motor of the higher cost S77, as well as the 400 pound user weight limit (the S73's is only 350 pounds). The Sole S73 comes with a lifetime motor, deck and frame warranty, five year parts warranty and two year labor warranty.